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Voyage to the bottom of the lough
A yellow robot submarine has been on a mission to the bottom of Lough Erne in Northern Ireland in search of aliens.
These are not extra-terrestrials, but foreign zebra mussels that have invaded the lake.
The submarine has been developed by Leo Steenson, from Glenarm in County Antrim, who is a PhD student at the University of Southampton.
BBC Northern Ireland's district journalist in Fermanagh, Julian Fowler, has been to watch the sub in action.
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